381561067765 has 8 divisors (see below), whose sum is σ = 460519948728. Its totient is φ = 303484409280.

The previous prime is 381561067711. The next prime is 381561067799. The reversal of 381561067765 is 567760165183.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65097440164 + 316463627601 = 255142^2 + 562551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381561067765 - 2⁷ = 381561067637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220554666 + ... + 220556395.

It is an arithmetic number, because the mean of its divisors is an integer number (57564993591).

Almost surely, 2^381561067765 is an apocalyptic number.

It is an amenable number.

381561067765 is a deficient number, since it is larger than the sum of its proper divisors (78958880963).

381561067765 is a wasteful number, since it uses less digits than its factorization.

381561067765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441111239.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 381561067765 in words is "three hundred eighty-one billion, five hundred sixty-one million, sixty-seven thousand, seven hundred sixty-five".